ePMP 1000 ePTP drop session and high CPU load

Products ePMP
1

Hi We have a PTP with two ePMP 1000 5 GHz, in ePTP master/slave mode.

It's a very short link, about 200 meters, with RSSI -53 dBm, tx power -4 dBm, SNR 42 dBm and MCS D/U stable at 15. We see that the session, randomly, is lost, even when the throughput is low (30-40 Mbps).

No DFS.

To reduce downtime to 5-6 seconds, there is only one frequency selected in the frequency list.

I don't know if it's correlated, but when the traffic load is at maximum (~95 Mbps aggregated), load average is unusually high, for a bridge installation: 95 %

- edit -

Sorry, forgot to say firmware: 3.0, on both devices. Same problem with 2.6.1.

2

Curious... we may be having similar issues. What happens when you convert the link to TDD-PTP?

We've had something possibly similar happen with some ePTP links, and we did a test and converted one to TDD-PTP and the problem went away.

3

We are having same issues with a epmp PTP in eptp mode, about 1,5 miles and drop session at high throughput(80-90Mbps). v3.0

4
@Eric Ozrelic wrote:

Curious... we may be having similar issues. What happens when you convert the link to TDD-PTP?

We've had something possibly similar happen with some ePTP links, and we did a test and converted one to TDD-PTP and the problem went away.

Later this day I'll give a try with TDD,

Thanks.

5

Hi,

my last two links had problems with eptp mod , I could not test much because they where very active swiching to TDD solved it also!

6

It seems switching to TDD PTP solved the drop session issue also for me.

As drawback the higher latency, but this was expected.

CPU load seeems to be slightly higher.

7

Hi, I got this problem with FW version 3.0.1. I want use ePTP for better latency. Will be in the next version the problem solved? Is problem solvet in beta FW?

Thanks

Mark